It was off the top of the plant and broke off when it got caught against the line going to the heatsink. The plant was big so it was bound to break a chunk off regardless of how careful i wasClones usually take a week or two to root. It's possible that sprig was already partially broken off or in contact with the rocks and was throwing roots even before you stuck it in. Then again, maybe you've just stumbled onto an ideal cloner, lol